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# LPH 105 W15 6.4-7

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## Richard Datwyler

on 19 May 2016

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#### Transcript of LPH 105 W15 6.4-7

A 60 kg kid jumps nearly straight up from the top of a 2.0 m tall platform with an initial speed of 4.5 m/s, above a trampoline.
(b) if it can be modeled as a spring with constant 58,000 N/m how far will it depress?
(a) how fast is he going when he hits the trampoline?
A sled is initially given a shove up a frictionless 23.0 degree incline. It reaches a maximum vertical height of 1.22 m above where it started. What was its initial speed?
A 50 kg girl bungee jumps off a bridge with the bungee tied around her ankle. She falls 15 m before the cord starts to stretch. The cord behaves as a spring with constant 55 N/m. If we assume she is 5'4" how tall does the bridge need to be?
(b) If the snow is level at the foot of the hill and friction is the same, how far will it go until it stops?
A ski starts from rest and slides down a 25 degree incline that is 75 m long.
(a) if the coefficient of friction is 0.090 what is the speed at the base of the incline.

A skier traveling 11.0 m/s at the foot of a steady upward 20 degree incline and glides 15 m up the slope before stopping. What is the average coefficient of friction?
"How do we know whether the Fgravity in the problem should be positive or negative?"
"I'm having a really hard time understanding what equals what and why."
"I'm still having trouble determining the difference between a conservative and a non-conservative force and why they need to be separated into two different groups since they are similar forces on similar objects"
"I still could use some help with hookes law?"
""What is the change in kinetic energy if I drop a 10.5 kg rock a distance of 1.70 m? (answer should look like '234 J')"
4.89 m/s
7.7 m/s
.258 m
44.15 m
22.4 m/s
284 m
.074
h=1.6256 m